Wow, I find it hard to believe this would be a deception of Satan...
We must look for what are the fruits, I would think it's necessary or at least prudent, to first ask what fruit has this "miracle" produced? Seems that if the church is [still] NO or has no plans whatsoever to reject the NO and convert to the true faith, then the "miracle" is not from God. Or if not that whole church, then at least the priest and/or some parishioners. Either way, it seems a no brainer that all NO miracles cannot be held authentic, at least not until or unless they produce good fruit - in the case of the NO, that means a conversion to the true faith before anything else.